What's in this package
Every piece below is included in your system price — matched to optimize efficiency, power and compatibility. Tap a piece to see its full description, specs and manuals.
The MRCOOL® Olympus MULTI3-18HP230C-O is a high-performance 18,000 BTU multi-zone heat pump condenser designed to power up to three indoor units simultaneously. Perfect for homeowners looking to efficiently manage temperatures in multiple spaces, this ductless system offers individualized climate control for each connected zone, making it a flexible solution for modern living environments. Built with advanced inverter technology, the unit delivers impressive efficiency, with SEER2 ratings up to 25.1 and HSPF2-4 up to 10. It performs reliably in diverse conditions, operating in outdoor temperatures as low as 5°F, ensuring comfort in both summer and winter months. This model is compatible with various
MRCOOL indoor units, including wall-mounted, ceiling cassette, and concealed duct options, giving users the freedom to tailor the system to their home’s layout and aesthetics. Smart features elevate user convenience, with control options that include the MRCOOL SmartHVAC app, traditional remotes, or even voice commands via Amazon Alexa and Google Assistant. Additional functions such as sleep mode, auto restart, and refrigerant leak detection contribute to enhanced safety and comfort. Backed by a 7-year warranty on the compressor and 5 years on parts (with professional installation), the MRCOOL®Olympus MULTI3-18HP230C-O is a reliable and energy-efficient choice for those seeking customized, zone-specific heating and cooling.
Features
- Installation by a licensed professional required where applicable 7-Year Compresser, 5-Year Parts warranty when registered and installed by a licensed professional R-454B environmentally friendly refrigerant Energy Star Certified
Works With
- O-09-HP-WMAH-230C-O
- DUCT-09HP-230B-O
- CASSETTE09HP-230C-O
- O-12-HP-WMAH-230C-O
- DUCT-09HP-230B-O
- CASSETTE12HP-230C-O
- Net Dimensions (In)
- 13.46 D x 26.5 H x 35.04 W
- Net Weight (Lbs)
- 100.53
- Gross Depth (In)
- 17.24
- Gross Height (In)
- 29.53
- Gross Width (In)
- 40.55
- Gross Weight (Lbs)
- 109.35
- Color
- White
- Max Coverage Area
- Up to 750
- Inverter
- DC
- Metering Device
- EXV + Capillary
- SEER2
- Up to 25.1
- EER2
- Up to 14
- HSPF2-4
- 9.8
- HSPF2-5
- 7.8
- Tonnage
- 1.5
- Cooling Capacity (Btu)
- 18000
- Heating Capacity (Btu)
- 19000
- Cycle
- 60
- Zone Capacity
- 3
- Compressor Motor Type
- Twin-Rotary
- Condenser Fan Motor Rpm
- 750/600/500
- Decibel Rating (Dba)
- 59.5
- Voltage (V)
- 208/230
- Phase
- 1
- Max Fuse Breaker (A)
- 20
- Min Circuit Ampacity (A)
- 16
- Refrigerant Type
- R-454B
- Refrigerant Volume (Oz)
- 61.73
- Max Lineset Length (Ft)
- 196.8 total
- Lineset Fitting Type
- Flare
- Liquid Line Size
- 3 x 1/4
- Suction Line Size
- 3 x 3/8
- UL Listed
- Yes
- CSA Listed
- Yes
- ETL Listed
- Yes
- Energy Star Certified
- Yes
- AHRI Certified
- Yes
- Has Batteries
- Yes
- Contains Electronics
- Yes
- Contains Chemicals
- Yes
- Contains Compressed Gas
- Yes
- Proposition 65 Warning
- Yes
- Restricted States
- GU, PR, VI
- Base Warranty
- 5-Year Parts/7-Year Compressor
- Base Parts Warranty
- 5-Year
- Base Compressor Warranty
- 7-Year
- Base Remote Warranty
- 5 Year
- Registered Labor Warranty
- None
- Base Labor Warranty
- None
Enjoy reliable heating and cooling with the MRCOOL® OLYMPUS ESTAR® 9k Series air handler, designed to deliver year-round comfort for spaces up to 400 square feet—ideal for single rooms, home offices, garages, and more. Its compact size allows for quick and easy installation, making setup a breeze for your installer.
Equipped with the MRCOOL® Smart HVAC app, this unit offers convenient Wi-Fi connectivity, letting you control it from your smartphone or tablet, no matter where you are. Prefer a more traditional approach? Use the included remote control for simple access to your preferred settings. Built with efficiency in mind, the unit boasts impressive performance ratings: SEER2 of 25.8, EER2 of 14.9, and HSPF2-4 of 12.5—helping you cut down on energy costs.
With multiple indoor fan speeds and whisper-quiet operation at just 47 dB, you’ll barely notice it’s there while enjoying consistent comfort. Now using eco-friendly R-454B refrigerant, this system is better for the environment without compromising on power or performance.
You’ll also enjoy versatile control options, including voice command compatibility with Amazon Alexa and Google Assistant.
Backed by an industry-leading warranty—including a limited lifetime warranty, 7-year compressor coverage, and a 5-year parts warranty—the MRCOOL® OLYMPUS ESTAR® 9k Series offers advanced technology, dependable performance, and personalized climate control for years to come.
Works With
- O-ES-09-HP-C-230C-O1
- MULTI3-18HP230C-O
- MULTI4-27HP230C-O
- MULTI5-36HP230C-O
- MULTI6-48HP230C-O
- Net Dimensions (In)
- 9.09 D x 11.81 H x 33.74 W
- Net Weight (Lbs)
- 23.37
- Gross Depth (In)
- 12.2
- Gross Height (In)
- 14.57
- Gross Width (In)
- 36.22
- Gross Weight (Lbs)
- 29.98
- Mount Type
- Wall
- Color
- White
- Max Coverage Area
- Up to 400
- Number Of Speeds
- 5 (Variable)
- Oscillation
- Yes
- Tonnage
- 0.75
- Cycle
- 60
- Blower Motor Speeds
- 441.4/323.7/229.6/176.6/147.2
- Blower Motor Rpm
- 1100/850/700
- Decibel Rating (Dba)
- 38/38/33/20.5/19.5
- Decibel Rating Low (Dba)
- 19.5
- Decibel Rating High (Dba)
- 38
- Voltage (V)
- 208/230
- Phase
- 1
- Max Fuse Breaker (A)
- 15
- Min Circuit Ampacity (A)
- 3
- Refrigerant Type
- R-454B
- Lineset Fitting Type
- Flare
- Liquid Line Size
- 1/4
- Suction Line Size
- 3/8
- Filter Type
- Reusable
- Auxiliary Heater Included
- No
- Auxiliary Heater Available
- No
- Fan Only Option
- Yes
- Sleep Mode
- Yes
- Auto Cool
- Yes
- Wifi Compatibility
- Yes
- App Compatibility
- Yes
- Works With Ios
- Yes
- Works With Android
- Yes
- Remote Control Included
- Yes
- Ul Listed
- Yes
- Csa Listed
- Yes
- Etl Listed
- Yes
- Has Batteries
- Yes
- Contains Electronics
- Yes
- Contains Chemicals
- Yes
- Contains Compressed Gas
- Yes
- Proposition 65 Warning
- Yes
- Restricted States
- GU, PR, VI
- Base Warranty
- 5-Year Parts
- Base Parts Warranty
- 5-Year
- Base Remote Warranty
- 5 Year
- Registered Labor Warranty
- None
- Base Labor Warranty
- None
MRCOOL Mini Split BTU Guide
Drawn to scale — 1 square = 2 × 2 ftThis system’s condenser supports up to 18K BTU connected. Toggle zones to see how your mix loads it — MRCOOL allows connecting more than 100% because zones rarely all run at max.
Customer Reviews
I needed to replace another unit that a previous contractor didn't do any part of that installation correctly, and the condensation line was leaking inside the house, running down the wall since that installation!! The indoor coil was 1-1/2" out of level, the line set wasn't wrapped, the electrical was tapped into the same circuit as the garage light and outlets...it was a mess.
It took me more time to demo the old unit out than to install the one I bought from you.
Thank you.
Very pleased with the price, delivery, ease of installation, and above all during this heatwave it is working excellently.
I ordered a 2 zone unit for the bedrooms in our home. It took a few months to arrive (manufacturer issue, nothing to do with HOD, and we were contacted on more than one occasion with an order update which was much appreciated!), but when it did arrive was very easy to install. Both the heat and AC function work perfectly, and our family is very happy!
I ordered a HVAC system and it arrived in a timely manner and with no apparent issues. I thought the system was defective once installed but it was the installers fault who wired it wrong. My only issue would be the fee (30% I believe) to return a defective item within the 30 day return policy. If it is defective the customer shouldn't have to pay a fee to return an item that is not operating as designed. Other than that this is a good company.
Installed my own central HP system. It was a bit of work but nothing beyond a person with basic mechanical and electrical skills. It took me a while because I had to remove the existing electric forced air furnace from a pretty tight place. Some custom sheet metal work and a bit of custom electrical too. Worked perfectly when powered up and I actually like the thermostat provided, although I wish it was clearer how to set up a temperature set-back schedule. Pre-charged refrigerant piping was something new and I liked that too. The best thing is that my electric utility forked out $4,000 and that paid for the unit!
